\section{Altimeter operation.}

With the altimeter placed in the payload bay of the rocket, and the ejection
charges properly installed, the operation in the field is as follows:

\begin{enumerate}
\item Altimeter jumper in off position.
\item Connect igniter \#1 (drogue).
\item Connect igniter \#2 (main) - this can be overlooked if no dual-deployment system is used.
\item Connect the battery.
\item Altimeter jumper in on position.
\end{enumerate}

\subsection{Communications.}

The description of the acustic/optic protocol used for all communications
between the altimeter and the operator is thoroughly explained in the
appendix.

The communication cicle from the moment the altimeter is turned on to the time of it's recovery is:

\begin{enumerate}
\item Altimeter is turned on: \textbf{OK} + \textbf{No OK}.
\item Continuity check of igniter \#1: \textbf{OK} or \textbf{NO OK}, depending on the result of the continuity check.
\item Continuity check of igniter \#2: \textbf{OK} or \textbf{NO OK}.
\item Reports, using acusti/optic protocol, of the last recorded estimation of max altitude in meters.
\item On ramp altitude reading: \textbf{OK} or \textbf{NO OK} according to result obtained.
\item Detection of the following events:

   \begin{enumerate}
   \item Lift off.
   \item Apogee.
   \item Altitude of main recovery system deployment.
   \item Landing.
   \end{enumerate}

\item Report, using an acusti-optic protocol, of the maximum altitude reached during flight.
\end{enumerate}

The last report is repeated every 3 seconds until the altimeter is turned off.
